OK I have a line of scratches on the top (smooth) part of my 02 WRX steering wheel. Not sure how it got there, looks like someone took a dull knife and ran it across for about two inches. It looks bad and feels rough, what's the best way to clean it up and make it smooth again? My poor baby is hurting...not only this but people keep giving it dents and scratches!

PLEASE HELP!